code: def test_cai_after_indexing():
      df = cudf.DataFrame({"a": [1, 2, 3]})
      cai1 = df["a"].__cuda_array_interface__
      df[["a"]]
      cai2 = df["a"].__cuda_array_interface__
      assert cai1 == cai2
  
file_path: cudf/python/cudf/cudf/tests/test_cuda_array_interface.py
imports: import types
  from contextlib import ExitStack
  import cupy
  import numpy
  import pandas
  import pytest
  from numba import cuda
  import cudf
  from cudf.core.buffer.spill_manager import get_global_manager
  from cudf.testing._utils import DATETIME_TYPES, NUMERIC_TYPES, assert_eq
label_desc: Use image node_id 8 for calling a global function with example usage: test_cai_after_indexing() without return types